Interfacial properties of polyelectrolyte complexes incorporating kraft lignin 10<sup>th</sup> EWLP, Stockholm, Sweden, August 25–28, 2008

Shulga, Galia; Shakels, Vadims; Aniskevicha, Olga; Zakharova, Julia; Skudra, Sanita

doi:10.1515/hf.2009.126

Cited by 7 publications

(12 citation statements)

References 7 publications

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“…8,9 In the past, the application of lignin in producing phenol, 10 liquid fuels, 11 activated carbon 12 and carbon fiber 13 were investigated. 24 Unlike lignosulfonate produced from a sulfite pulping process, kraft lignin is only soluble in alkaline solutions, which hinders its application in industry, 25,26 but it can be modified in order to overcome these difficulties. [14][15][16][17][18] Current research on producing lignin-based value-added products is mainly focused on lignosulfonate due to its high water solubility over a wide pH range.…”

Section: Introductionmentioning

confidence: 99%

“…27 Ouyang et al carried out the hydroxymethylation and sulfonation of alkali lignin, which increased its dispersibility in cement pastes by 85%. 25,26,30 Nevertheless, the molecular weight and number of functional group of lignin play an important role on its end-use application, and it was reported that the low molecular weight and relatively small number of functional groups on modified kraft lignin suppressed its application as a dispersant for cement. 29 Aso et al modified kraft lignin using polyethylene glycol diglycidylether, ethoxy (2-hydroxy) propoxy polyethylene glycol glycidylether, and dodecyloxy-polyethylene glycol glycidyl ether in order to prepare the lignin-based amphiphiles for cement dispersant.…”

Section: Introductionmentioning

confidence: 99%

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Water soluble kraft lignin–acrylic acid copolymer: synthesis and characterization

et al. 2015

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Lignin produced in the kraft pulping process is insoluble in water at neutral pH, which limits its application in industry. In this paper, kraft lignin (KL) was copolymerized with acrylic acid (AA) in an aqueous solution to produce a water soluble lignin-based copolymer. The copolymerization was carried out using K 2 S 2 O 8 -Na 2 S 2 O 3 as the initiator under alkaline aqueous conditions, and the influence of the reaction parameters, i.e. initiator dosage, reaction time and temperature, mole ratio of acrylic acid to lignin and reaction concentration, on resultant lignin copolymers were investigated. The mechanism of copolymerization of kraft lignin with acrylic acid was also discussed in this work. The resultant lignin copolymer was characterized by Fourier Transform Infrared (FTIR) spectrophotometry and Nuclear Magnetic Resonance (NMR). The successful copolymerization of AA and KL was confirmed by the new absorption peak of carboxyl anions in the FTIR spectrum and new peaks in the 1 H-NMR spectrum. At optimal conditions, the charge density and molecular weight of lignin copolymer reached 1.86 meq g −1 and 46 421 g mol −1 , respectively, and the solubility of lignin after reaction was increased from 1.80 g L −1 to 100 g L −1 at neutral pH. † Electronic supplementary information (ESI) available. See

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Water soluble kraft lignin–acrylic acid copolymer: synthesis and characterization

et al. 2015

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“…Obviously, the decrease in рН causes the hydrophobization of the lignin structure as a result of the protonization of the phenolic hydroxyl and carboxyl groups, promoting the association of the lignin macromolecules both in the aqueous solutions (Fig. 4, Table 1) and at the interface as it has been shown by some authors [3,8]. It can be assumed that the purposeful modification of aspen lignin will enable enhancing its surface tension properties at the water-air interface.…”

Section: Resultsmentioning

confidence: 74%

“…The preparation of samples and the measuring procedure were similar to those described by Shulga et al [3].…”

Section: Methodsmentioning

confidence: 99%

Characteristics and Properties of Soda Lignin Obtained from Aspen Wood By-Products

Livča¹,

Verovkins²,

Shulga³

et al. 2012

Latvian Journal of Chemistry

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In the work, soda lignin was obtained under laboratory alkaline delignification conditions from aspen sawdust. The chemical composition and the surface-active properties of this lignin in aqueous solutions were studied. The high indices of Klason lignin and the content of methoxyl groups indicated the insignificant presence of non-lignin admixtures, including lignocarbohydrate complexes, in the purified lignin. It was shown that aspen lignin was a surface active substance, the surface activity of which at the water-air interface grew with falling the solution рН values. Simultaneously, with decreasing рН, the particle sizes of aspen lignin in the aqueous solutions increased, but zeta potential of the lignin particles had the tendency to decrease.

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“…Another method for modification of HL particles (MHL 2 ) was its amination with diethylepoxypropylamine (DEEPA) [18]. MHL 3 and MHL 4 were obtained by modification of HL with non-stoichiometric polyelectrolyte complexes (NPEC) [19], consisting of two polymers, namely, sulphate lignin/quaternary polymeric amine and sulphite lignin/acrylic polymer, respectively.…”

Section: Methodsmentioning

confidence: 99%

Biorefinery of the Lignocellulosic Waste of Wood Processing for Environmental Sustainability

Shulga¹,

Neiberte²,

Verovkins³

et al. 2014

The 9th International Conference "Environmental Engineering 2014"

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The lignocellulosic biomass remaining after the chemical and mechanical processing of wood in Eastern European countries is commonly used to produce energy that is not beneficial from the economic, social and environmental points of view. Owing to the notable deposits of a lignocellulosic by-product such as hydrolysis lignin in Belarus and Lithuania (as a waste of the post-hydrolysis industry), its tailored biorefinery is an urgent problem. In this paper, results of the application of the hydrolysis lignin modified with various chemical methods as a filler in the wood polymer composite and a mulch for prevention of soil erosion are presented. The obtained results testify that the purposeful modification of hydrolysis lignin by the treatment of the non-stoichiometric polyelectrolyte complex, incorporating quaternary polymeric amine and sulphate lignin, as well as by diethylepoxypropylamine with the aim of the partial replacement of the more expensive wood flour in the wood polymer composite, favours the remarkable improvement of the mechanical properties of the composite and the decrease of its ability to adsorb water. The modification of the hydrolysis lignin particles as a mulch with a non-stoichiometric polyelectrolyte complex sulphite lignin/acrylic polymer by the impregnation method creates more favourable conditions in the soil for decreasing water evaporation, increasing mulch cohesiveness and fertility of soil, in comparison with the case of the initial hydrolysis lignin.

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Interfacial properties of polyelectrolyte complexes incorporating kraft lignin 10^th EWLP, Stockholm, Sweden, August 25–28, 2008

Cited by 7 publications

References 7 publications

Water soluble kraft lignin–acrylic acid copolymer: synthesis and characterization

Water soluble kraft lignin–acrylic acid copolymer: synthesis and characterization

Characteristics and Properties of Soda Lignin Obtained from Aspen Wood By-Products

Biorefinery of the Lignocellulosic Waste of Wood Processing for Environmental Sustainability

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Interfacial properties of polyelectrolyte complexes incorporating kraft lignin 10th EWLP, Stockholm, Sweden, August 25–28, 2008

Cited by 7 publications

References 7 publications

Water soluble kraft lignin–acrylic acid copolymer: synthesis and characterization

Water soluble kraft lignin–acrylic acid copolymer: synthesis and characterization

Characteristics and Properties of Soda Lignin Obtained from Aspen Wood By-Products

Biorefinery of the Lignocellulosic Waste of Wood Processing for Environmental Sustainability

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Product

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Interfacial properties of polyelectrolyte complexes incorporating kraft lignin 10^th EWLP, Stockholm, Sweden, August 25–28, 2008